[zaik]

I wouldn't be so sure. If you create a Matrix account and join an IRC channel, your username[m] will never leave the channel, even if you never use Matrix again. I made a few test accounts and it was rather difficult to figure out how leave IRC channels properly if you decide not to use Matrix anymore.

[Arathorn]

If you part the matrix room, you’ll part the IRC channel.

You can also disconnect from IRC entirely from the bridge admin room.

Finally, if someone joins a channel via Matrix and then disappears without parting or disconnecting, then after 30d we’ll boot them off IRC anyway.